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  Subjects -> CHEMISTRY (Total: 845 journals)
    - ANALYTICAL CHEMISTRY (47 journals)
    - CHEMISTRY (596 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (26 journals)
    - INORGANIC CHEMISTRY (42 journals)
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ANALYTICAL CHEMISTRY (47 journals)

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Accounts of Chemical Research     Full-text available via subscription   (Followers: 78)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 20)
American Journal of Analytical Chemistry     Open Access   (Followers: 27)
Analytica Chimica Acta     Hybrid Journal   (Followers: 39)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 33)
Analytical Chemistry     Full-text available via subscription   (Followers: 214)
Analytical Chemistry Insights     Open Access   (Followers: 17)
Analytical Chemistry Research     Open Access   (Followers: 1)
Analytical Letters     Hybrid Journal   (Followers: 11)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 9)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 24)
Current Analytical Chemistry     Hybrid Journal   (Followers: 7)
Drug Testing and Analysis     Hybrid Journal   (Followers: 5)
Electroanalysis     Hybrid Journal   (Followers: 5)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 4)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 21)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 3)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 5)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 6)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 19)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 1)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 5)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 22)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 2)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 9)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 13)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 5)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 52)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 2)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 11)
World Journal of Analytical Chemistry     Open Access   (Followers: 1)
Journal Cover Journal of Analytical Chemistry
  [SJR: 0.33]   [H-I: 19]   [19 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2281 journals]
  • Determination of ceftriaxone by the fluorescence quenching of quantum dots
           using binding with polyethyleneimine
    • Abstract: Abstract It is found that antibiotic ceftriaxone reacts with polyethyleneimine in aqueous solutions, probably, with the formation of a noncovalent molecular complex (complex I). The product of hydrolysis of complex I, when heated in an aqueous solution (product II), quenches the fluorescence of CdSe/CdS/ZnS coreshell- shell quantum dots, probably, because of the formation of free thiol groups. A possibility of ceftriaxone determination in aqueous solutions is demonstrated. The performance characteristics of the procedure using a spectrofluorimeter and a photocamera combined with a UV light-emitting diode are close to each other (cmin = 1 × 10–6 M, RSD = 10%). Na+, Ca2+, glucose, urea, uric acid, erythromycin, ciprofloxacin, and doxycycline produce no analytical signals under the conditions of ceftriaxone determination.
      PubDate: 2016-05-01
       
  • A study on the isotope composition of carbon 13 C in poppy seeds and
           narcotic poppy straw present in the same package aimed at the revelation
           of the possible artificial superinducements of a narcotic substance
    • Abstract: Abstract The rise in crime associated with the illicit trafficking in narcotics and psychotropic substances is one of the most severe problems in Russia today. In recent years, cases of using seeds of poppy plant “masked as food,” the bulk of which contains macroparticles of poppy straw visible to an unaided eye and which can be used as raw materials for the preparation of narcotic substances have become more frequent. In his work, using a Delta V Advantage isotopic mass spectrometer, we proposed criteria based on which tone can reveal artificial superinducements of poppy straw into “food” poppy seeds or their absence.
      PubDate: 2016-05-01
       
  • Methods for the minimization of errors of the determination of isotope
           ratios in laser mass spectrometry
    • Abstract: Abstract The main sources of errors in the determination of isotope ratios in multielement laser mass spectrometry are considered. The optimum operation conditions of the laser source and measurement and processing of analytical signals, ensuring the reduction of relative errors of the determination of isotope ratios to the values of several tenths and hundredths of percent are proposed.
      PubDate: 2016-05-01
       
  • QuEChERS method combined with GC‒MS for pesticide residues
           determination in water
    • Abstract: Abstract A miniaturized, QuEChERS based, liquid–liquid extraction method followed by gas chromatography–mass spectrometry was developed and validated for pesticide residues determination in water. Malathion, chlorpyrifos, profenofos, chlorfenapyr, pyriproxyfen, λ-cyhalothrin, coumaphos and α-cypermethrin were selected for this study. The accuracy, precision, specificity, linearity, limit of detection and limit of quantification were evaluated. The recovery ranged from 85.3 to 107% with RSD ranging from 1.8 to 15.4%. The linearity showed reliable range (0.995–0.999). The limit of detection ranged from 0.3 to 4 μg/L. Matrix effect was evaluated. The obtained results meet the European Commission standard legislations, implying that our method can be considered accurate and reproducible. The validated method was used to analyze river and well water samples. No residues of the investigated pesticides were detected in all collected water samples.
      PubDate: 2016-05-01
       
  • Thin-layer chromatography applied to foods of animal origin: a tutorial
           review
    • Abstract: Abstract The chromatography techniques are partially characterized by presence of two phases (stationary and mobile), which allows identification, semi-quantification or quantification of important compounds in different matrices. Among chromatography methods, the thin-layer chromatography (TLC) must be considered for using in routine laboratories due to a number of advantages such as practicality, fast results and effectiveness, low cost, and simultaneous determination of analytes. This review describes the application of this technique to foods of animal origin, as well as compares TLC with other chromatographic methods. TLC has a strong potential as a surrogate chromatographic model for qualitative and quantitative analysis. Therefore, several modifications have been carried out to the conventional TLC system. Nevertheless, further studies should be performed in order to contribute with the scientific community and propagate the TLC method, which has performance and economic advantages compared to other chromatographic techniques.
      PubDate: 2016-05-01
       
  • Determination of selenium and cadmium dopants in nanocomposites based on
           zinc and indium oxides by high resolution continuous source electrothermal
           atomic absorption spectrometry and inductively coupled plasma mass
           spectrometry
    • Abstract: Abstract An approach is proposed to the determination of selenium and cadmium dopants in new nanocomposites based on zinc and indium oxides. The approach is based on a combination of highly efficient high resolution continuous source electrothermal atomic absorption spectrometry (ETAAS) for the analysis of suspensions and inductively coupled plasma mass spectrometry for the analysis of solutions. A procedure is developed for the determination of Se and Cd dopants and matrix components based on Zn and In in nanocomposite solutions by inductively coupled plasma mass spectrometry. Stabilizing agents for the preparation of suspensions are studied for the ETAAS analysis of powders without their decomposition. The results of determination of CdSe dopants by high resolution ETAAS are validated by inductively coupled plasma mass spectrometry.
      PubDate: 2016-05-01
       
  • Application of Zn(NCS) 4 2- and Co(NCS) 4 2- -selective electrodes to the
           analysis of natural objects and foods
    • Abstract: Abstract Concentrations of zinc and cobalt in beer, mineral water, beets, cheese, potatoes, and soil are determined by potentiometry, using film Zn(NCS) 4 2- and Co(NCS) 4 2- -selective electrodes based on higher quaternary ammonium salts. The developed electrodes enable the determination of zinc and cobalt in concentrations lower than their maximum permissible concentrations (MPCs). The procedures do not require complex or long sample preparation or expensive equipment. The results agree well with the data of atomic emission spectrometry and atomic absorption spectrometry.
      PubDate: 2016-05-01
       
  • Thermal lens spectrometry in electromigration methods of analysis
    • Abstract: Abstract We consider the basic principles, instruments, problems, and examples of application of thermal lens spectroscopy and microscopy, highly sensitive force methods of molecular absorption spectroscopy, in various embodiments of electromigration methods of analysis, particularly, capillary electrophoresis and microfluidic chip electrophoresis. Examples illustrating the sensitivity and selectivity of the combined methods are presented.
      PubDate: 2016-05-01
       
  • Synthesis and characterization of a liquid crystal containing oxadiazole
           and its performance for the separation of isomers by gas chromatography
    • Abstract: Abstract Liquid crystals are used as the stationary phase in gas chromatography to separate close-boiling isomers. In this paper, a new nematic liquid crystal containing oxadiazole was prepared by condensation of the amino group of 4-(5-(ethylthio)-1,3,4-oxadiazole-2-yl)aniline and the aldehyde group of p-methoxy-benzaldehyde. The compound was characterized by NMR, IR, X-ray diffraction, polarized light microscopy, and differential scanning calorimetry. The liquid crystal was used as the stationary phase in gas chromatography, and the nematic phase separated a variety of isomers, such as benzene derivatives, ionone, and citral.
      PubDate: 2016-05-01
       
  • Adsorption of Eu(III) ions on silicas with noncovalently immobilized
           thiacalix[4]arene derivatives
    • Abstract: Abstract Using the noncovalent immobilization of some thiacalix[4]arene derivatives on the surface of silanized silica, we obtained efficient adsorption materials for the extraction of Eu(III) ions from aqueous solutions of medium mineralization. The specific surface area of the adsorbents is 200–370 m2/g. It is shown that adsorbents containing thiacalix[4]arenes with phosphoryl groups selectively extract up to 99% of europium ions from aqueous solutions at pH 5.5–6; they are characterized by adsorption capacity of 7.5–14.5 mg/g and high distribution coefficients. The studied adsorbents exhibit high selectivity with respect to Eu(III) ions, wherein the distribution coefficients for Cs, Sr, Tb(III), Sm(III), Gd(III), La(III), and UO 2 2+ are five times or more smaller.
      PubDate: 2016-05-01
       
  • Determination of four lignanoids in roots, stems and leaves of Zanthoxylum
           armatum DC by HPLC-DAD with HPLC-ESI–QTOF-MS confirmation
    • Abstract: Abstract A rapid, effective method through an orthogonal design was developed, and four lignanoids were determined by HPLC and confirmed by HPLC coupled with electrospray ionization and quadrupole timeof-flight mass spectrometry (HPLC-ESI–QTOF-MS). The roots, stems and leaves of Zanthoxylum armatum DC were extracted by methanol for 15 min under reflux. Separation was performed using an UPLC system to quantify four bioactive compounds, namely fargesin, asarinin, planispine A and planispine B, in 12 batches of samples of different origin from China. Furthermore, the samples were analyzed using HPLC-ESI–QTOF-MS to confirm the results. The calibration curves of all four analytes showed good linearity (R > 0.998). Accuracy, precision and repeatability were all within required limits. The mean recoveries measured at the three concentrations were higher than 99% with RSDs lower than 4.1%. The established HPLC-DAD method could serve as a rapid and effective method for quality evaluation of Zanthoxylum armatum DC.
      PubDate: 2016-05-01
       
  • Experimental observation and numerical simulation of spectra of
           solid-anode X-ray tubes
    • Abstract: Abstract Possibilities of the experimental measurement and theoretical modeling of a fluorescence spectrum of a solid-anode X-ray tube are studied. A setup for the direct measurement of spectra of X-ray tubes of different types is created, spectra of a commercial BKh15 Svetlana X-ray tube are measured in wide range of anode voltages and currents. Calculations of spectra using the Ebel algorithm (Horst Ebel, 2006) with the parameters recommended in the original work ensure the satisfactory quality of the reproduction of the measured spectra, but demonstrate some statistically noticeable deviations. The optimization of model parameters ensures the improvement of the quality of simulation.
      PubDate: 2016-05-01
       
  • Selective photometric determination of low conentrations of selenium(IV)
           and selenium(VI) in bottled drinking water
    • Abstract: Abstract A procedure is developed for the selective photometric determination of selenium(IV) in bottled drinking water by the oxidation of Methylene Blue in 1 M HCl to colorless decomposition products and of selenium(VI) by its interaction with the specified reagent at pH 5–6 with the formation of a colored ion pair. The limits of detection are 1 and 0.8 µg/L, respectively. At the concentration of selenium(IV) 2 µg/L, the admissible weight ratios are: SeO4 2-, Br3 - (1: 20); Br– (1: 60); I–, IO3 - and IO4 - (1: 100). At equal concentration of selenium(VI), the following species: SeO4 2-(1: 20); Br3 -, Br–, I–, IO3 -, and IO4 - (1: 100) do not interfere with the determination. Other anions and cations present in highly mineralized waters do not interfere with the determination. The relative error of determination is 8–10% in the concentration range 2–10 µg/L of selenium(IV) and selenium(VI) and does not exceed 5% in their concentration range of 10–100 µg/L.
      PubDate: 2016-04-01
       
  • Extraction of humic substances from fresh waters on solid-phase cartridges
           and their study by Fourier transform ion cyclotron resonance mass
           spectrometry
    • Abstract: Abstract Humic substances (HS) have been extracted from fresh waters on macroporous adsorbents of different types, Amberlite XAD-8 resin and Bond Elute PPL solid-phase cartridge. Comparative analysis of the extracted samples by ultra-high resolution mass spectrometry demonstrated selectivity of the selected adsorbents to the components of the molecular assembly of HS: the XAD-8 resin has affinity to the higher oxidized aromatic compounds and PPL has affinity to substances of stronger aliphatic character and nitrogen-containing compounds. Because of this fact, a comparison of the molecular composition of HS isolated from various sources must be performed taking into account selective adsorption; therefore, it is necessary to compare the products extracted by the same adsorbent for correct interpretation.
      PubDate: 2016-04-01
       
  • Determination of Rare earth elements in environmental samples by solid
           phase extraction ICP OES
    • Abstract: Abstract A simple sample pre-treatment method for rare earth elements enrichment from environmental water samples prior to optical emission spectrometry determination with inductively coupled plasma (ICP OES) is proposed based on solid phase extraction with octadecyl silica gel modified with 1,2,5,8-tetrahydroxyanthraquinone. Optimal experimental conditions including pH of sample solution, sample volume, type, concentration and volume of eluent were investigated and established. Rare earth elements ions were quantitatively adsorbed from aqueous solution onto octadecyl silica gel modified with Quinalizarin at pH 7.0. The adsorbed ions were eluted with 1.0 mL of 2 M HNO3 and simultaneously determined by ICP OES. Under obtained optimum conditions the calibration curves were linear with the coefficient of variation better than 0.99. The limit of detection of the method for the studied elements was in the range of 0.0004–0.01 ng/mL. The proposed method has a pre-concentration factor of 320–450 in water samples, which results in high sensitivity detection of trace ions. The developed method gave recoveries better than 80% and RSDs less than 15%.
      PubDate: 2016-04-01
       
  • Specific features of the determination of carbonyl compounds in
           atmospheric air
    • Abstract: Abstract It has been shown that the error of the determination of formaldehyde in atmospheric air depends both on the method of measurement of the analytical signal and on the conditions of air sampling. In most cases, the use of HPLC leads to underestimated results, while the application of spectrophotometry leads to overestimated results. A method has been developed for the selective determination of formaldehyde in atmospheric air using HPLC with a fluorescence detector, which can be used as a reference method.
      PubDate: 2016-04-01
       
  • Silica-based mesoporous organic-inorganic nano-hybrid: a novel
           electroceramic nanomaterial for electroanalytical determination of
           selected cardiovascular drugs in human serum
    • Abstract: Abstract Magnetic mesoporous silica was used for electrode modification and electro-oxidation of some cardiovascular drugs. The modified electrode was applied for detection of cardiovascular drugs using cyclic voltammetry, chronoamperometry, and differential pulse voltammetry. The modified electrode shows many advantages as an electrochemical sensor such as simple preparation method without using any specific electron transfer mediator or specific reagent, high sensitivity, excellent activity, short response time, long term stability and remarkable antifouling property toward for cardiovascular drugs and its oxidation product. Finally, the applicability of the sensor for determination of the selected drugs in human serum samples has been successfully demonstrated.
      PubDate: 2016-04-01
       
  • Potential of gas chromatography in the determination of low-volatile
           dicarboxylic acids
    • Abstract: Abstract The analysis of published data shows that the results of the gas chromatographic determination of low-volatile polar aliphatic dicarboxylic acids are rather poorly reproducible. A considerable part of the published values of their retention indices appears to be erroneous. The experimental verification of the capabilities of gas chromatography and gas chromatography–mass spectrometry demonstrates that some of the compounds of this series (for example, glutaric acid) can be determined without decomposition; others are characterized by the formation of products of interaction with solvents (oxalic acid), and in some cases, the only detectable moieties are products of thermal degradation (citric acid).
      PubDate: 2016-04-01
       
  • Identification and determination of mycotoxins and food additives in feed
           by HPLC–high-resolution time-of-flight mass spectrometry
    • Abstract: Abstract High-resolution time-of-flight mass spectrometry combined with high performance liquid chromatography is proposed for the detection and determination of 25 mycotoxins and 8 food additives (coccidiostats) in animal feed, using simplified and rapid sample preparation. We developed a procedure for the identification and determination of analytes by the standard addition method. The lower limit of the analytical range is 1 (400) µg/kg for mycotoxins; the analytical range for coccidiostats in feed is 10–200 mg/kg. The relative standard deviation of the results does not exceed 10%. The analysis time is 0.5–1 h.
      PubDate: 2016-04-01
       
  • Capabilities of capillary electrophoresis for the determination of
           atenolol and bisoprolol
    • Abstract: Abstract The electrophoretic behavior of hypotensive drugs (bisoprolol and atenolol) under the conditions of varied pH, ionic strength of the leading electrolyte, applied voltage, and temperature has been studied. Possibilities of the application of capillary electrophoresis to the determination of the identity, purity, and amount of the studied drugs in raw materials and finished dosage forms have been discussed.
      PubDate: 2016-04-01
       
 
 
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